[codemod][lowrisk] Remove extra semi colon from caffe2/c10/util/Float8_e5m2.h (#115761)

Summary:
`-Wextra-semi` or `-Wextra-semi-stmt`

If the code compiles, this is safe to land.

Test Plan: Sandcastle

Reviewed By: palmje

Differential Revision: D51995078

Pull Request resolved: https://github.com/pytorch/pytorch/pull/115761
Approved by: https://github.com/Skylion007

caffe2/utils/conversions.h

@@ -28,8 +28,8 @@ CONVERSIONS_DECL OUT Get(IN x) {
   return static_cast<OUT>(x);
 }
 
-}; // namespace convert
+} // namespace convert
 
-}; // namespace caffe2
+} // namespace caffe2
 
 #undef CONVERSIONS_DECL